According to this
, the show is called Follow That Man (Man Against Crime), a 1953 Ralph Bellamy TV show. The episode is titled: "MIDNIGHT EXPRESS", described as "Murder aboard a speeding train as Mike (Barnett) infiltrates a counterfeit ring. Guest stars Audrey Meadows and Jack Lord." It would be nice to see the entire episode, I can't really give it a rating - oh what the heck 3 stars because the clip is available and interesting (perhaps because
of its brevity), & it intrigued me enough to make me do some research!